The latest attempt to end the 37-year mystery involving the disappearance of former Teamsters boss Jimmy Hoffa started Friday at a suburban work shed outside Detroit.

Hoffa disappeared on July 30, 1975, and was last seen outside a restaurant in suburban Oakland, Mich. A key figure during the heyday of the labor movement, Hoffa was convicted in of jury tampering and fraud before being pardoned by President Nixon. The many unknowns surrounding his disappearance have added to his legend, with the National Museum of Organized Crime & Law Enforcement in Las Vegas featuring a section on Hoffa conspiracy theories, for instance.

Not that local police actually expect to find Mr. Hoffa's remains beneath the concrete-floored shed in Roseville, Mich. “We aren't saying it's not Jimmy Hoffa. We're just saying the odds are very remote,” James Berlin, police chief of Roseville told the Detroit News.